The mystery of ROSAT Blank Field Sources

Details The mystery of ROSAT Blank Field Sources The mystery of ROSAT Blank Field Sources

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.2616c&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #26.16; Bulletin of the American Astronomical Society, Vol. 32, p.1225

Astronomy and Astrophysics

Astronomy

Scientific paper

The ROSAT survey contains a surprising number of ``blank field" sources i.e. bright X-ray sources (fX>10-13) with no optical counterpart on the Palomar Sky survey (O>21.5) within their 99% radius error circle. For comparison a typical type 1 AGN at these X-ray fluxes would have (O ~ 18). The faintness of any optical counterpart means that ROSAT blank field sources have extreme X-ray to optical ratios (fX/f_V >60), incompatible with any known population. They also have unusual X-ray colors (flatter ROSAT spectra compared to radio-quiet AGNs). Without further constraints these sources might be any of a number of possible objects, from isolated old neutron stars, to reddened AGN, to `failed clusters'. We discuss the possibilities on the basis of both theROSAT PSPC data, and newly aquired Chandra and infrared IRTF data.

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